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This paper presents the design process of a 13.56 MHz 10 kW and high efficiency inverter for wireless power transfer systems. The new 650V E-mode GaN is used in multiphase resonant topology to obtain high output power. The optimized efficiency design and the driver design are presented in detail. The circuit simulation results show that the inverter achieves 10 kW output power with the efficiency...
This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
This paper presents a bootstrap driver that can operate a normally-on, a depletion-mode, GaN FET power device as a normally-off device. The bootstrap driver based on a diode-clamp circuit which is composed of a capacitor and a diode, shifting the input voltage by a negative amount (−10V) to turn off the power switch with a negative threshold (−8V). However, due to the clamp capacitor discharge by...
Wide-band-gap devices can provide much faster switching speed. But the dv/dt of switching node voltage also becomes much higher, causing potential common mode noise issue. On the other hand, PCB winding transformer has significant large inter-winding capacitance, which provides a low impedance path for common mode noise. In this paper, a symmetrical resonant converter as well as a symmetrical PCB...
A high-performance DC-DC converter is presented to improve the efficiency and modularity of the vehicular power system. The converter is capable of bidirectional power transfer between the isolated voltage sources. GaN semiconductor switches in the converter turn on and off softly by utilizing the energy stored in the leakage inductance of a transformer. A quasi-resonant operation is also explained...
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